Thomas james dekne and august hentschel



UNITED STATES PATENT OFFICE.

THOMAS JAMES DENNE AND AUGUST HENTSOHEL, OF LONDON, ENGLAND.

IMPROVEMENT IN GLAZING PHOTOGRAPHS, &c.

Specification forming part of Letters Patent No. 132,640, dated October 29, 1872.

To all whom it may concern:

Be it known thatwe, THOMAS J AMZES DENNE and AUGUST HENTSOHEL, both of the Phoenix Works, Mile End, London, England, have invented or discovered certain Improvements in Protecting and Glazing Impressed Surfaces of Photographs, Prints, and Papers; and we do hereby declare that the following is a full, true, and particular description thereof sufficient to enable others to understand and use our said invention-that is to say,

According to these improvements, which relate particularly to a method of surfacing prints, drawings, photographs, wall-papers,

colored, plain, printed, or other papers, with a coating or surface of caseine, thereby making them practically permanent by the protection given to their faces, and protecting them from the action of damp in addition to being smooth and glass-like upon the surface, similar in appearance to the paper known as gelatine paper, we take the substance caseine and dissolve it, and we prefer, for the purpose of dissolving the caseine, to employ a solution of boiled soap and water, preferably whitesoap, or otherwisewater to which a few drops of ammonia have been added, and with this dissolved caseine we cover the piece of paper, presumably a print, about to be surfaced, either by swimming it or brushing it on. We then dry the paper, which may be done by natural process or by artificial heat. In this way we obtain a bright-coated surface or covering of caseine upon any required paper or paper foundation, which, by a subsequent process, we render smooth and glass like, with, an appearance resembling that of ordinary gelatine paper, being insolublein water and a protection against the-act i and wipe it over with gall'for ftb p 1 preventing the paper from V glass, and in order tosoftenand preparethe paper for the final treatment-we make a bath of water, to which we addr an'acid, preferably acetic acid, by reason "of its property of rendering caseine insoluble in water; or we add in place of the acid either alum or gall; but

, damp. To effect this we take a sheet-"of 'gl-a'ss T hereunto set'ourhands this IOth'dayofAugust,

we find that the best result is obtained by the use of both acetic acid and gall in the bath, securing thereby the double purpose of ten dering the new surface insoluble in water, and

of'causing it to leave the glass more easily. We plunge the print for a few seconds into this bath, and, withdrawing it, lay it with the caseine face downward on the glass. We then wipe the back of the print over with a squeezer in order to press the paper perfectly smooth and flat upon the glass, to remove any air that may remain between the paper and the glass, and to drive off superfluous water. When dry the paper will leave the glass having the glazed and polished appearance which is presented by ordinary gelatine paper.

In preparing the solution of caseine for surfacing the paper a portion of gall maybe added in the first instan ce'to the solution; but paper resembling the ordinary gelatine paper may be produced without this admixture by following out the process as above described.

If we desire to make paper of any particular color we can add any coloring ingredient in the first instance to the caseine. If we desire to give greater flexibility to the caseine surface we add to the dissolved caseine a little glycerine.

No precise quantity of any of the ingredients named has been given for use in any part of this process, as widely different quantities will give the desired result, and the proportions may be varied. according to the different articles surfaced and the results aimed at.

Claim is made to Treating prints, drawings, photographs, and other similar surfaces or bodies with caseine, in the manner and for the purposes set forth.

In witness, whereof we, the said THOMAS JAMES DENNE andAUeUsT H NTsotmL, have one thousand eight hundred and seventy-two.

. T. J. DENNE.

AUGUST HENTSOHEL.

v Witnesses:

H. GARDNER, E. M. DANIEL,

166 l 'leetstreet, London. 

